What is the characteristic equation of the identity matrix I2×2I_{2 \times 2}I2×2?
λ2−1=0\lambda^2 - 1 = 0λ2−1=0
λ2−2λ+1=0\lambda^2 - 2\lambda + 1 = 0λ2−2λ+1=0
λ2=0\lambda^2 = 0λ2=0
λ2+1=0\lambda^2 + 1 = 0λ2+1=0